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W. H. MALLORY. SPARK-ARRESTER AND-CONSUMER.

N 174,141. Patented Feb. 29, 1876.

N.PETERS. FMUTO-LITHOGRAPHER. WASHINGTON D C viunLiAM H. MALLOBY, or BRIDGEPORT, CONNECTICUT.

Specification forming part of Letters Patent No. 174,141, dated February '29, 1876 application filed October 6, 1875.

To all whom it may concern Be it known that I, WILLIAM H. MALLORY, .of Bridgeport, in the county of Fairfield and State of Connecticut, have invented a new Improvement in Blasts for Locomotive and other Boiler Furnaces; and 1 do hereby defclare the following, when taken in connection with the accompanying drawings, and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent,in- Figure 1, longitudinal section Fig. 2, modification.

This invention relates to animprovement in the method of creating or accelerating a draft for the fires ofsteam-boilers, particu- G, the smoke-stack, of substantially the usual or any known construction. This smokestack 0 opens into a flue or pipe, D, running to below the'fire grate, the mouth or the pipe D extending'forward of the smoke-stack and somewhatv expanding into funnel shape.

I In this month a second funnel-shaped-or auxiliary mouth is introduced, contracted at its rear end, and opening in close proximity to a correspondingly-contracted mouth of the smoke-stack. I I y p F is the exhaust-pipe, which turns into the mouth E, and opens near the inne'r ehd, so as to direct the exhaust to the exit and in line across the opening of the smoke-stack.

With this construction suppose the movement to be forward,as indicated by the an row, a large amount of air enters through the mouth E, as well as through the mouth of the flue D, and, by the. contraction of the mouth E, the air is forciblyrdriven to the rear over the opening a in the smoke-stack, and there creates a correspondingly strong draft up through the smoke stack, and to the rear, carrying the products of combustion, with power proportioned to the velocity, around to the fire, where the products of combustion will be consumed, and, at the same time, a blast created for the tire.

The exhaust, which enters through the pipe F, is forced across the opening of the smokestack in like manner as described for the air, and, to that extent, increases the draft, as well as forces the exhaust steam with the products of combustion back to the'fire', where the steam aids combustion, and the blast increases the draft.

'When stationary, or in stationary boilers, the exhaust may be used in like relation to the opening of the smoke-stack, with a corresponding favorable result, or, instead of the exhaust, a jet of live steam will accomplish the same result.

A single month only is necessary on movin g boilers. The two, as shown, are', however,

preferable as admitting a larger amount of air.

In Fig. 2 the exhaust is shown as running through the smoke-stackand turned back through the rear or contracted ends of the mouths, and in rear of the opening of the smoke-stack, so that a draft from the smokestack is created instead of over' it, as first represented, the-result and principle, how

ever, being substantially the samethat is to say, the automatic combined steam and air blast to carry the'products'of combustion directly to the fire to increase the draft and aid in supporting combustion.

1., In combinationwith the smoke-stack or discharge from a steam-boilerfnrnace, a flue leading from the exit of the said smoke-stack directly to the fire, the forward end of the said flue open to the atmosphere, and a steam-jet turning into the said flue toward the fire, substantially as specified.

2. The smoke-stackor discharge from a steam-boiler furnacefcontracted at its exit,

combined with an open flue leading from the said discharge directly to the fire, and a steamjet across the said contracted exit of the smokestack, substantially as set forth.

3. The smoke-stack or dischargefrom a steam-boiler furnace, contracted at its exit, combined with a flue leading-from the said discharge directly to the fire, and afunnel- 2 D a 1mm shaped month, E, contracted toward the, contracted end of the smokestack, and at right angles thereto, substantially as described, so as to create a blast across the said contracted end of the smoke-stack, substantially as specdischarge directly to the fire,a tunnel-shaped thereto, and a steam-jet directed into 'the con-' tracted end of the month across the contracted end of the smoke-stack, substantially as set forth. v a

- W. H. (MALLORY. Witnesses:

JOHN E. YEARLE, CLARA BROUGHTON'. 

